<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <script src="js/jquery.min.js"></script>
    <link href="css/nullAdd.css" rel="stylesheet">
    
    <title>问卷调查</title>
</head>

<body>
    <div id="header"></div>
    <main>
        <div style="text-align: center; padding: 150px;">
            <button type="button" class="btn-add">
                <a href="add.html">+&nbsp;新建问卷</a>
            </button>
        </div>
    </main>

</body>
<script>
    $("#header").load("currency.html");//load 方法参数是引入公共文件的路径
</script>

</html>